That's a lot of miles for a one year old car. I would first look at the service record to see if it has been serviced properly. That being good, the price seems OK, maybe a few K high. I would also ask the seller to let your mechanic look at the vehicle, just to dot your i's and cross your t's. With all that in mind, I would go for it.
First of all, check the car by the VIN code, you can decipher the VIN code of the infinity using the Nissan VIN decoder. It will show vehicle history by vin and you will be able to make the right decision for yourself about buying this vehicle even before inspecting it.